On Teallite, a New Sulphostannite of Lead from Bolivia; and its Relations to Franckeite and Cylindrite

G. T. Prior

Assistant in the Mineral Department of the British Museum.

Summary: Characters of Teallite:—

Grey-black colour, metallic lustre, soils paper like graphite, occurs in flexible folia with nearly square outline, perfect basal cleavage, hardness, 1–2, does not scratch gypsum, density, 6·36. Orthorhombic, a:b:r = 0·93 : 1 : 1·31. Chemical formula, PbSnS₂.

Probable chemical formula of franckeite:— Pb₅FeSn₃Sb₂S₁₄ = 3PbSnS₂ + Pb₂FeSb₂S₈.

Probable chemical formula of cylindrite:— Pb₃FeSn₄Sb₂S₁₄ = 3PbSnS₂ + SnFeSb₂S₈.

Mineralogical Magazine; October 1904 v. 14; no. 63; p. 21-27; DOI: 10.1180/minmag.1904.014.63.06
© 1904, The Mineralogical Society
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